✨ Allow mix instructions for multiple programs in workspace

[lukacan]

Description

This PR improves the logic of generating fuzz_instructions.rs. Currently, in case of multiple programs in the workspace, each program has its module and separate FuzzInstructions. This PR merges the FuzzInstructions generated in fuzz_instructions.rs in that case, if multiple programs are present in a workspace it is possible to create instructions sequences of calling both programs not only one. Moreover, as introduced in the previous PR, the get_program_id function was implemented for IxOps trait , this ensures that the Instructions contain the program ID of their corresponding Program.

Notes:

• In case of the same account names across multiple programs, account storage in FuzzAccounts will be generated as _ (appended snake case program name)
• In case of the same instruction names across programs, the Instruction Variants in FuzzInstructions are generated as InstructionNameProgramName (appended as Upper Camel)

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